var floatObj = function() {
	//加法
	function add(arg1, arg2) {
		var r1, r2, m;
		try {
			r1 = arg1.toString().split(".")[1].length
		} catch(e) {
			r1 = 0
		}
		try {
			r2 = arg2.toString().split(".")[1].length
		} catch(e) {
			r2 = 0
		}
		m = Math.pow(10, Math.max(r1, r2))
		return(arg1 * m + arg2 * m) / m
	}
	//减法
	function subtract(arg1, arg2) {
		var r1, r2, m, n;
		try {
			r1 = arg1.toString().split(".")[1].length
		} catch(e) {
			r1 = 0
		}
		try {
			r2 = arg2.toString().split(".")[1].length
		} catch(e) {
			r2 = 0
		}
		m = Math.pow(10, Math.max(r1, r2));
		n = (r1 >= r2) ? r1 : r2;
		return((arg1 * m - arg2 * m) / m).toFixed(n);
	}
	//乘法
	function multiply(arg1, arg2) {
		var m = 0,
			s1 = arg1.toString(),
			s2 = arg2.toString();
		try {
			m += s1.split(".")[1].length
		} catch(e) {}
		try {
			m += s2.split(".")[1].length
		} catch(e) {}
		return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m)
	}
	//除法
	function divide(arg1, arg2) {
		var t1 = 0,
			t2 = 0,
			r1, r2;
		try {
			t1 = arg1.toString().split(".")[1].length
		} catch(e) {}
		try {
			t2 = arg2.toString().split(".")[1].length
		} catch(e) {}
		with(Math) {
			r1 = Number(arg1.toString().replace(".", ""))
			r2 = Number(arg2.toString().replace(".", ""))
			return (r1/r2)*pow(10,t2-t1); 
		}
	}
	//
	function Fixed(num, s) {
    var times = Math.pow(10, s)
    var des = num * times + 0.5
    des = parseInt(des, 10) / times
    return des + ''
}

	return {
		add: add,
		subtract: subtract,
		multiply: multiply,
		divide: divide,
		Fixed:Fixed
	}
}()